has anyone used Bryston amps for bass?

They'd be on the heavy side, and all the way on the pricey side, but I bet they'd sound amazing. One of the few power amp companies that does well in the high end recording and mastering studio world and also in the home stereo world. The 20 year warranty isn't a bad deal either.

Unfortunately, most amps made for home and the Studio do not have the constructions (chasis, etc.) for heavy road use. Perhaps with a shock mount case (more weight) or in a single location application they would work well. But I would not want to bang them up on the road. Plus I don't have roadies, weight IS a factor!

Back when Brysons first came out they were being used on the road with some touring sound companies. They seemed to stand up fine. Of course, about the only other competition then in solid state was Crown.

I used to have a couple BGW amps in a rack for my touring rig. They were pretty good too.

Bryston is the BADDEST, most rugged amp out on the market. Sure they're heavy, buy man, there's no substitute for good old iron! Their 20 year warrantee does not exclude road use. If you can afford the watts, and can carry the weight, buy one. You'll never want another amp.
One major bass only amp company that everyone seems to love(but will remain nameless here), reverse engineered a 4B SST for their power section. That should say something.
Corey